Shaking screen, particularly resonance screen



y 7, 1959 R. TEUTEBERG 2,893,559

SHAKING SCREEN, PARTICULARLY RESONANCE SCREEN Filed July 8, 1957 2Sheets-Sheet l ill/[425% V a I INVENTOR RUDOLF TEUTEBERG ATTORNEYSSHAKING SCREEN, PARTICULARLY RESONANCE SCREEN Filed July 8, 195'.

R. TEUTEBERG July 7, 1959 2 Sheets-Sheet 2 INVENTOR RUDOLF 7Z'UTEBERGATTORNEYS United States Patent SHAKING SCREEN, PARTICULARLY RESONANCESCREEN Rudolf Teuteberg, Dortmund, Germany, assignor to Schuchtermann &Kremer-Baum Aktiengesellschaft fur Anfbereitung, a corporation ofGermany Application'July 8, 1957, Serial No. 670,555 Claims priority,application Germany July 10, 1956 6 Claims. (Cl. 209-365) Thedevelopment of the stops requires particular care.

In particular the surface of the stops which strikes against the elasticrecoil buffers must be carefully smoothened in order to avoid prematurewear of the recoil buflers which consist predominantly of rubber. Up tothe present time, the stops have been made intergal with their mount bycasting or welding. In this connection, the careful smoothing of theeffective stop surfaces however affords considerable diificulties andexpense, particularly costs for tools, since the surfaces of the supportare only accessible with difiiculty to the machining tools.

In accordance with the present invention, the stops are fastened in aremovable manner and centered via extensions in pairs in the bore of aholding piece fastened to the screen box. The stops can thus be machinedseparated from the holding member and are preferably developed as bodiesof revolution. Since the stops are not included in the shaping of theholding piece, there is obtained a compact construction of the holdingpiece of light weight. The stops can, for instance, be clamped againsteach other in the holding piece via clamping screws passing centrallythrough them. In another embodiment of the invention, the stops arescrewed into the holding piece via the threaded extensions. In bothembodiments, but particularly in the last mentioned embodiment, it isadvantageous to develop the holding member provided with a bore as alongitudinally slit socket so that the stops can be clamped fast in anypositions independent of each other by tightening the clamping screws ofthe socket.

Two embodiments of the fastening of the stops in accordance with theinvention are shown in the drawing.

Fig. 1 shows a buffer arrangement in section, while Fig. 2 is a sectionalong the line 2-2 of Fig. 1. Fig. 3 shows a bufifer arrangement inaccordance with Fig. 1 with modified displacement block, Fig. 3a shows asimilar embodiment in which, however, the stop and buffer supports areinterchanged. Fig. 4 shows another embodiment of the recoil buffer unitin vertical section, while Figs. 5 and 6 are sections along the lines5-5 and 66 respectively of the embodiment shown in Figs. 4 and 5respectively.

The displacement block 1 is arranged on the screen frame 2 and bears twocorresponding buffer plates, one of which 3 is arranged on the endsurface 4 of the displacement block 1 while the other 5 is held by twoclamping spindles 6, 7 at the desired distance from the plate 3. Bothbuffer plates 3, 5 bear on their facing surfaces circular elastic recoilbuffers 8, 9 acting as storage springs. Between the two recoil buffers8, 9 there are provided stops 10, 11 which are fastened by means of aholding member 12 to the screen box 13.

The holding member 12 has a bore 14 which provides an accurate seat forthe stops 10, 11 provided with a centering ring 15 and clamped by acentral clamping screw 16. The play a between the stops 10, 11 and thecorresponding recoil buifers 8, 9, which is the same on both sides inthe central position of the screen box, can be changed tothe desiredextent and accurately adjusted by the insertion of replaceable shimdisks 17 between the holding member 12 and stops 10, 11..

Of course, the reversal of the arrangement shown in Figs. 1 and 2 isfeasible in accordance with which the recoil buifers instead of thestops are fastened to the holder member and the stops assume theposition of the recoil buffers shown in the figure. Furthermore, asshown in Fig. 3, the displacement block 18 can be developed assupporting rail with a recess 19 to receive the buffer plates, etc. Inthis way, the two clamping spindles 6, 7 can be dispensed with.Furthermore, the attachment of the displacement block in the framewhich, as a rule, is a boxshaped hollow girder is facilitated. It isthen merely necessary to provide a recess in the girder through whichits fastening end is passed in order then to weld it at the longitudinaledgesto the girder for the attachment. In Fig. So there is shown anarrangement similar to that of Fig. 3. In this connection, however, thedisplacement block 181 has two corresponding stop plates 101' and 111,while the corresponding recoil buffers 81, 91 have their bufier plates41, 51 fastened to the holder member 121. In this connection, the playwhich is the same on both sides can be set by changing the positioneither of the stops or of the buffer plates.

The shaking screen, in accordance with Figs. 4 to 6, consists of thebase frame 21 and the screen box 22 supported thereon with guidesprings. The screen box engages in the swinging direction via stops 23,24 fastened to it between two recoil buifers 25, 26 which are fastenedto the base frame 21 by means of a support 27. The atrangement in thisconnection is such that a free clearance a, a is present between thepair of stops 23, 24 and the corresponding recoil buffers 25, 26.Depending on the size of the shaking screen, two or more recoil buflerunits 2526 are provided between the screen box and its base frame.

The screen box 22 and its base frame 21 are placed in shaking motionsdirected opposite to each other by a rocker drive arranged between themwith loose coupling. In this connection, the screen box is swung backand forth between the recoil buffers 25, 26 in swinging direction withan amplitude which is greater the greater the setting of the play a, abetween the recoil buffers 25, 26 and the stops 23, 24.

In order to be able suitably to adjust the play a, a at all times to therequirements, the stops 23, 24 are screwed with threaded pins 28, 29from the front sides into a common supporting socket 30. The supportingsocket 30 has its supporting frame 31 fastened to the screen box in sucha manner that its longitudinal central axis lies in the direction ofswing of the screen box. It is slit in longitudinal direction, has aninternal thread which fits the threaded pins 28, 29 and is also providedwith clamping screws 32. By the screwing of the stops 23, 24 to agreater or lesser extent into or out of the holding socket 30, the playa can be set as desired for each stop in ac cordance with therequirements. By tightening the clamping screws 32, the stops can befirmly clamped in the new position in the holding socket.

In this embodiment also it is unimportant whether, as shown in thefigure, the recoil buffers 25, 26 are seated on the base frame orwhether they are seated on the screen box. It is also directly possibleto fasten the recoil buffers to the adjustable stops 23, 24 and toascribe the function of. the stops to the support 27 and par,- ticularlythe supporting plates 33, 34.

I claim:

1. In a shaking: screen comprising a screen frame serving as acounterweight, a screen box and mounting means including stops andbuffers operatively interconnected. between the screen frame and screenbox for aidingin defining shaking of the screen box relative to thescreen frame;v the improvement which comprises pairs of: elastic recoilbuffers mounted on the screen frame, a pair of stops mounted in aholding member, the stops of each pair being axially aligned and inoppositely disposed relationship, anextension for each holding memberfixedly securing the holding member to the screen box with the'stopsofthe holding member operatively disposed with play between the bufiers ofa pair of said elastic recoil buffers, and means for detaching the stopsfromthe' holding members.

' 2; A shaking screen according to claim 1, the holding members eachcomprising a [hollow tube having end portions providing seats for thestops mounted thereon, and clamping means for urging the stops towardeach other into engagement with said seats.

3. A shaking screen according to claim 1, each stop having, athreadedshank projecting axially from the stopopposite the working facetheref,the holding memhers each comprising an internallythreaded-tube-in which the shanks of its stops are threaded.

4. A shaking screen. according to claim 1, each stop 4 having a shankprojecting axially from the stop opposite the working face thereof, theholding members each comprising a hollow tube in which the shanks of theholding members stops are received, and positioning means forselectively positioningithe shanks axially in the holding member tubes.

5. A shaking screen according to claim 4, the positioning meanscomprising an axially'extending slit in the holding member extendingfihelength thereof, and means for urging'the slit closed to therebysecure the said shanks in place.

6. A shaking device according to claim 1, comprising a displacement barfixedly secured to the screen frame and having means defining a recesstherein, a pair of elastic recoil buffers being mountedin said recess, apair of stops being operatively disposed between the buffers mounted insaid recess.

, References Cited in the file of this patent UNITED STATES PATENTS2,332,600 Rapp Oct. 26, 1943 2,701,061 Kluge Feb. 1, 1955 FOREIGNPATENTS Germany Sept. 27, 1937 932,643 Germany Sept. 5, 1955 459,642.Great Britain Jan. 12, 1937 698,223 Great Britain Oct. 7, 1953

